[mirror_ubuntu-jammy-kernel.git] / drivers / leds / leds-aw2013.c

// SPDX-License-Identifier: GPL-2.0+
// Driver for Awinic AW2013 3-channel LED driver

#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/regmap.h>

#define AW2013_MAX_LEDS 3

/* Reset and ID register */
#define AW2013_RSTR 0x00
#define AW2013_RSTR_RESET 0x55
#define AW2013_RSTR_CHIP_ID 0x33

/* Global control register */
#define AW2013_GCR 0x01
#define AW2013_GCR_ENABLE BIT(0)

/* LED channel enable register */
#define AW2013_LCTR 0x30
#define AW2013_LCTR_LE(x) BIT((x))

/* LED channel control registers */
#define AW2013_LCFG(x) (0x31 + (x))
#define AW2013_LCFG_IMAX_MASK (BIT(0) | BIT(1)) // Should be 0-3
#define AW2013_LCFG_MD BIT(4)
#define AW2013_LCFG_FI BIT(5)
#define AW2013_LCFG_FO BIT(6)

/* LED channel PWM registers */
#define AW2013_REG_PWM(x) (0x34 + (x))

/* LED channel timing registers */
#define AW2013_LEDT0(x) (0x37 + (x) * 3)
#define AW2013_LEDT0_T1(x) ((x) << 4) // Should be 0-7
#define AW2013_LEDT0_T2(x) (x) // Should be 0-5

#define AW2013_LEDT1(x) (0x38 + (x) * 3)
#define AW2013_LEDT1_T3(x) ((x) << 4) // Should be 0-7
#define AW2013_LEDT1_T4(x) (x) // Should be 0-7

#define AW2013_LEDT2(x) (0x39 + (x) * 3)
#define AW2013_LEDT2_T0(x) ((x) << 4) // Should be 0-8
#define AW2013_LEDT2_REPEAT(x) (x) // Should be 0-15

#define AW2013_REG_MAX 0x77

#define AW2013_TIME_STEP 130 /* ms */

struct aw2013;

struct aw2013_led {
	struct aw2013 *chip;
	struct led_classdev cdev;
	u32 num;
	unsigned int imax;
};

struct aw2013 {
	struct mutex mutex; /* held when writing to registers */
	struct regulator *vcc_regulator;
	struct i2c_client *client;
	struct aw2013_led leds[AW2013_MAX_LEDS];
	struct regmap *regmap;
	int num_leds;
	bool enabled;
};

static int aw2013_chip_init(struct aw2013 *chip)
{
	int i, ret;

	ret = regmap_write(chip->regmap, AW2013_GCR, AW2013_GCR_ENABLE);
	if (ret) {
		dev_err(&chip->client->dev, "Failed to enable the chip: %d\n",
			ret);
		return ret;
	}

	for (i = 0; i < chip->num_leds; i++) {
		ret = regmap_update_bits(chip->regmap,
					 AW2013_LCFG(chip->leds[i].num),
					 AW2013_LCFG_IMAX_MASK,
					 chip->leds[i].imax);
		if (ret) {
			dev_err(&chip->client->dev,
				"Failed to set maximum current for led %d: %d\n",
				chip->leds[i].num, ret);
			return ret;
		}
	}

	return ret;
}

static void aw2013_chip_disable(struct aw2013 *chip)
{
	int ret;

	if (!chip->enabled)
		return;

	regmap_write(chip->regmap, AW2013_GCR, 0);

	ret = regulator_disable(chip->vcc_regulator);
	if (ret) {
		dev_err(&chip->client->dev,
			"Failed to disable regulator: %d\n", ret);
		return;
	}

	chip->enabled = false;
}

static int aw2013_chip_enable(struct aw2013 *chip)
{
	int ret;

	if (chip->enabled)
		return 0;

	ret = regulator_enable(chip->vcc_regulator);
	if (ret) {
		dev_err(&chip->client->dev,
			"Failed to enable regulator: %d\n", ret);
		return ret;
	}
	chip->enabled = true;

	ret = aw2013_chip_init(chip);
	if (ret)
		aw2013_chip_disable(chip);

	return ret;
}

static bool aw2013_chip_in_use(struct aw2013 *chip)
{
	int i;

	for (i = 0; i < chip->num_leds; i++)
		if (chip->leds[i].cdev.brightness)
			return true;

	return false;
}

static int aw2013_brightness_set(struct led_classdev *cdev,
				 enum led_brightness brightness)
{
	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
	int ret, num;

	mutex_lock(&led->chip->mutex);

	if (aw2013_chip_in_use(led->chip)) {
		ret = aw2013_chip_enable(led->chip);
		if (ret)
			goto error;
	}

	num = led->num;

	ret = regmap_write(led->chip->regmap, AW2013_REG_PWM(num), brightness);
	if (ret)
		goto error;

	if (brightness) {
		ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
					 AW2013_LCTR_LE(num), 0xFF);
	} else {
		ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
					 AW2013_LCTR_LE(num), 0);
		if (ret)
			goto error;
		ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
					 AW2013_LCFG_MD, 0);
	}
	if (ret)
		goto error;

	if (!aw2013_chip_in_use(led->chip))
		aw2013_chip_disable(led->chip);

error:
	mutex_unlock(&led->chip->mutex);

	return ret;
}

static int aw2013_blink_set(struct led_classdev *cdev,
			    unsigned long *delay_on, unsigned long *delay_off)
{
	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
	int ret, num = led->num;
	unsigned long off = 0, on = 0;

	/* If no blink specified, default to 1 Hz. */
	if (!*delay_off && !*delay_on) {
		*delay_off = 500;
		*delay_on = 500;
	}

	if (!led->cdev.brightness) {
		led->cdev.brightness = LED_FULL;
		ret = aw2013_brightness_set(&led->cdev, led->cdev.brightness);
		if (ret)
			return ret;
	}

	/* Never on - just set to off */
	if (!*delay_on) {
		led->cdev.brightness = LED_OFF;
		return aw2013_brightness_set(&led->cdev, LED_OFF);
	}

	mutex_lock(&led->chip->mutex);

	/* Never off - brightness is already set, disable blinking */
	if (!*delay_off) {
		ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
					 AW2013_LCFG_MD, 0);
		goto out;
	}

	/* Convert into values the HW will understand. */
	off = min(5, ilog2((*delay_off - 1) / AW2013_TIME_STEP) + 1);
	on = min(7, ilog2((*delay_on - 1) / AW2013_TIME_STEP) + 1);

	*delay_off = BIT(off) * AW2013_TIME_STEP;
	*delay_on = BIT(on) * AW2013_TIME_STEP;

	/* Set timings */
	ret = regmap_write(led->chip->regmap,
			   AW2013_LEDT0(num), AW2013_LEDT0_T2(on));
	if (ret)
		goto out;
	ret = regmap_write(led->chip->regmap,
			   AW2013_LEDT1(num), AW2013_LEDT1_T4(off));
	if (ret)
		goto out;

	/* Finally, enable the LED */
	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
				 AW2013_LCFG_MD, 0xFF);
	if (ret)
		goto out;

	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
				 AW2013_LCTR_LE(num), 0xFF);

out:
	mutex_unlock(&led->chip->mutex);

	return ret;
}

static int aw2013_probe_dt(struct aw2013 *chip)
{
	struct device_node *np = chip->client->dev.of_node, *child;
	int count, ret = 0, i = 0;
	struct aw2013_led *led;

	count = of_get_child_count(np);
	if (!count || count > AW2013_MAX_LEDS)
		return -EINVAL;

	regmap_write(chip->regmap, AW2013_RSTR, AW2013_RSTR_RESET);

	for_each_available_child_of_node(np, child) {
		struct led_init_data init_data = {};
		u32 source;
		u32 imax;

		ret = of_property_read_u32(child, "reg", &source);
		if (ret != 0 || source >= AW2013_MAX_LEDS) {
			dev_err(&chip->client->dev,
				"Couldn't read LED address: %d\n", ret);
			count--;
			continue;
		}

		led = &chip->leds[i];
		led->num = source;
		led->chip = chip;
		init_data.fwnode = of_fwnode_handle(child);

		if (!of_property_read_u32(child, "led-max-microamp", &imax)) {
			led->imax = min_t(u32, imax / 5000, 3);
		} else {
			led->imax = 1; // 5mA
			dev_info(&chip->client->dev,
				 "DT property led-max-microamp is missing\n");
		}

		of_property_read_string(child, "linux,default-trigger",
					&led->cdev.default_trigger);

		led->cdev.brightness_set_blocking = aw2013_brightness_set;
		led->cdev.blink_set = aw2013_blink_set;

		ret = devm_led_classdev_register_ext(&chip->client->dev,
						     &led->cdev, &init_data);
		if (ret < 0)
			return ret;

		i++;
	}

	if (!count)
		return -EINVAL;

	chip->num_leds = i;

	return 0;
}

static const struct regmap_config aw2013_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = AW2013_REG_MAX,
};

static int aw2013_probe(struct i2c_client *client)
{
	struct aw2013 *chip;
	int ret;
	unsigned int chipid;

	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	mutex_init(&chip->mutex);
	mutex_lock(&chip->mutex);

	chip->client = client;
	i2c_set_clientdata(client, chip);

	chip->regmap = devm_regmap_init_i2c(client, &aw2013_regmap_config);
	if (IS_ERR(chip->regmap)) {
		ret = PTR_ERR(chip->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		goto error;
	}

	chip->vcc_regulator = devm_regulator_get(&client->dev, "vcc");
	ret = PTR_ERR_OR_ZERO(chip->vcc_regulator);
	if (ret) {
		if (ret != -EPROBE_DEFER)
			dev_err(&client->dev,
				"Failed to request regulator: %d\n", ret);
		goto error;
	}

	ret = regulator_enable(chip->vcc_regulator);
	if (ret) {
		dev_err(&client->dev,
			"Failed to enable regulator: %d\n", ret);
		goto error;
	}

	ret = regmap_read(chip->regmap, AW2013_RSTR, &chipid);
	if (ret) {
		dev_err(&client->dev, "Failed to read chip ID: %d\n",
			ret);
		goto error_reg;
	}

	if (chipid != AW2013_RSTR_CHIP_ID) {
		dev_err(&client->dev, "Chip reported wrong ID: %x\n",
			chipid);
		ret = -ENODEV;
		goto error_reg;
	}

	ret = aw2013_probe_dt(chip);
	if (ret < 0)
		goto error_reg;

	ret = regulator_disable(chip->vcc_regulator);
	if (ret) {
		dev_err(&client->dev,
			"Failed to disable regulator: %d\n", ret);
		goto error;
	}

	mutex_unlock(&chip->mutex);

	return 0;

error_reg:
	regulator_disable(chip->vcc_regulator);

error:
	mutex_destroy(&chip->mutex);
	return ret;
}

static int aw2013_remove(struct i2c_client *client)
{
	struct aw2013 *chip = i2c_get_clientdata(client);

	aw2013_chip_disable(chip);

	mutex_destroy(&chip->mutex);

	return 0;
}

static const struct of_device_id aw2013_match_table[] = {
	{ .compatible = "awinic,aw2013", },
	{ /* sentinel */ },
};

MODULE_DEVICE_TABLE(of, aw2013_match_table);

static struct i2c_driver aw2013_driver = {
	.driver = {
		.name = "leds-aw2013",
		.of_match_table = of_match_ptr(aw2013_match_table),
	},
	.probe_new = aw2013_probe,
	.remove = aw2013_remove,
};

module_i2c_driver(aw2013_driver);

MODULE_AUTHOR("Nikita Travkin <nikitos.tr@gmail.com>");
MODULE_DESCRIPTION("AW2013 LED driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
59ea3c9f NT	1	// SPDX-License-Identifier: GPL-2.0+
	2	// Driver for Awinic AW2013 3-channel LED driver
	3
	4	#include <linux/i2c.h>
	5	#include <linux/leds.h>
	6	#include <linux/module.h>
	7	#include <linux/regulator/consumer.h>
	8	#include <linux/mutex.h>
	9	#include <linux/of.h>
	10	#include <linux/regmap.h>
	11
	12	#define AW2013_MAX_LEDS 3
	13
	14	/* Reset and ID register */
	15	#define AW2013_RSTR 0x00
	16	#define AW2013_RSTR_RESET 0x55
	17	#define AW2013_RSTR_CHIP_ID 0x33
	18
	19	/* Global control register */
	20	#define AW2013_GCR 0x01
	21	#define AW2013_GCR_ENABLE BIT(0)
	22
	23	/* LED channel enable register */
	24	#define AW2013_LCTR 0x30
	25	#define AW2013_LCTR_LE(x) BIT((x))
	26
	27	/* LED channel control registers */
	28	#define AW2013_LCFG(x) (0x31 + (x))
	29	#define AW2013_LCFG_IMAX_MASK (BIT(0) \| BIT(1)) // Should be 0-3
	30	#define AW2013_LCFG_MD BIT(4)
	31	#define AW2013_LCFG_FI BIT(5)
	32	#define AW2013_LCFG_FO BIT(6)
	33
	34	/* LED channel PWM registers */
	35	#define AW2013_REG_PWM(x) (0x34 + (x))
	36
	37	/* LED channel timing registers */
	38	#define AW2013_LEDT0(x) (0x37 + (x) * 3)
	39	#define AW2013_LEDT0_T1(x) ((x) << 4) // Should be 0-7
	40	#define AW2013_LEDT0_T2(x) (x) // Should be 0-5
	41
	42	#define AW2013_LEDT1(x) (0x38 + (x) * 3)
	43	#define AW2013_LEDT1_T3(x) ((x) << 4) // Should be 0-7
	44	#define AW2013_LEDT1_T4(x) (x) // Should be 0-7
	45
	46	#define AW2013_LEDT2(x) (0x39 + (x) * 3)
	47	#define AW2013_LEDT2_T0(x) ((x) << 4) // Should be 0-8
	48	#define AW2013_LEDT2_REPEAT(x) (x) // Should be 0-15
	49
	50	#define AW2013_REG_MAX 0x77
	51
	52	#define AW2013_TIME_STEP 130 /* ms */
	53
	54	struct aw2013;
	55
	56	struct aw2013_led {
	57	struct aw2013 *chip;
	58	struct led_classdev cdev;
	59	u32 num;
	60	unsigned int imax;
	61	};
	62
	63	struct aw2013 {
	64	struct mutex mutex; /* held when writing to registers */
65	struct regulator *vcc_regulator;
66	struct i2c_client *client;
67	struct aw2013_led leds[AW2013_MAX_LEDS];
68	struct regmap *regmap;
69	int num_leds;
70	bool enabled;
71	};
72
73	static int aw2013_chip_init(struct aw2013 *chip)
74	{
75	int i, ret;
76
77	ret = regmap_write(chip->regmap, AW2013_GCR, AW2013_GCR_ENABLE);
78	if (ret) {
79	dev_err(&chip->client->dev, "Failed to enable the chip: %d\n",
80	ret);
81	return ret;
82	}
83
84	for (i = 0; i < chip->num_leds; i++) {
85	ret = regmap_update_bits(chip->regmap,
86	AW2013_LCFG(chip->leds[i].num),
87	AW2013_LCFG_IMAX_MASK,
88	chip->leds[i].imax);
89	if (ret) {
90	dev_err(&chip->client->dev,
91	"Failed to set maximum current for led %d: %d\n",
92	chip->leds[i].num, ret);
93	return ret;
94	}
95	}
96
97	return ret;
98	}
99
100	static void aw2013_chip_disable(struct aw2013 *chip)
101	{
102	int ret;
103
104	if (!chip->enabled)
105	return;
106
107	regmap_write(chip->regmap, AW2013_GCR, 0);
108
109	ret = regulator_disable(chip->vcc_regulator);
110	if (ret) {
111	dev_err(&chip->client->dev,
112	"Failed to disable regulator: %d\n", ret);
113	return;
114	}
115
116	chip->enabled = false;
117	}
118
119	static int aw2013_chip_enable(struct aw2013 *chip)
120	{
121	int ret;
122
123	if (chip->enabled)
124	return 0;
125
126	ret = regulator_enable(chip->vcc_regulator);
127	if (ret) {
128	dev_err(&chip->client->dev,
129	"Failed to enable regulator: %d\n", ret);
130	return ret;
131	}
132	chip->enabled = true;
133
134	ret = aw2013_chip_init(chip);
135	if (ret)
136	aw2013_chip_disable(chip);
137
138	return ret;
139	}
140
141	static bool aw2013_chip_in_use(struct aw2013 *chip)
142	{
143	int i;
144
145	for (i = 0; i < chip->num_leds; i++)
146	if (chip->leds[i].cdev.brightness)
147	return true;
148
149	return false;
150	}
151
152	static int aw2013_brightness_set(struct led_classdev *cdev,
153	enum led_brightness brightness)
154	{
155	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
156	int ret, num;
157
158	mutex_lock(&led->chip->mutex);
159
160	if (aw2013_chip_in_use(led->chip)) {
161	ret = aw2013_chip_enable(led->chip);
162	if (ret)
163	goto error;
164	}
165
166	num = led->num;
167
168	ret = regmap_write(led->chip->regmap, AW2013_REG_PWM(num), brightness);
169	if (ret)
170	goto error;
171
172	if (brightness) {
173	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
174	AW2013_LCTR_LE(num), 0xFF);
175	} else {
176	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
177	AW2013_LCTR_LE(num), 0);
178	if (ret)
179	goto error;
180	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
181	AW2013_LCFG_MD, 0);
182	}
183	if (ret)
184	goto error;
185
186	if (!aw2013_chip_in_use(led->chip))
187	aw2013_chip_disable(led->chip);
188
189	error:
190	mutex_unlock(&led->chip->mutex);
191
192	return ret;
193	}
194
195	static int aw2013_blink_set(struct led_classdev *cdev,
196	unsigned long delay_on, unsigned long delay_off)
197	{
198	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
199	int ret, num = led->num;
200	unsigned long off = 0, on = 0;
201
202	/* If no blink specified, default to 1 Hz. */
203	if (!delay_off && !delay_on) {
204	*delay_off = 500;
205	*delay_on = 500;
206	}
207
208	if (!led->cdev.brightness) {
209	led->cdev.brightness = LED_FULL;
210	ret = aw2013_brightness_set(&led->cdev, led->cdev.brightness);
211	if (ret)
212	return ret;
213	}
214
215	/* Never on - just set to off */
216	if (!*delay_on) {
217	led->cdev.brightness = LED_OFF;
218	return aw2013_brightness_set(&led->cdev, LED_OFF);
219	}
220
221	mutex_lock(&led->chip->mutex);
222
223	/* Never off - brightness is already set, disable blinking */
224	if (!*delay_off) {
225	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
226	AW2013_LCFG_MD, 0);
227	goto out;
228	}
229
230	/* Convert into values the HW will understand. */
231	off = min(5, ilog2((*delay_off - 1) / AW2013_TIME_STEP) + 1);
232	on = min(7, ilog2((*delay_on - 1) / AW2013_TIME_STEP) + 1);
233
234	delay_off = BIT(off) AW2013_TIME_STEP;
235	delay_on = BIT(on) AW2013_TIME_STEP;
236
237	/* Set timings */
238	ret = regmap_write(led->chip->regmap,
239	AW2013_LEDT0(num), AW2013_LEDT0_T2(on));
240	if (ret)
241	goto out;
242	ret = regmap_write(led->chip->regmap,
243	AW2013_LEDT1(num), AW2013_LEDT1_T4(off));
244	if (ret)
245	goto out;
246
247	/* Finally, enable the LED */
248	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
249	AW2013_LCFG_MD, 0xFF);
250	if (ret)
251	goto out;
252
253	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
254	AW2013_LCTR_LE(num), 0xFF);
255
256	out:
257	mutex_unlock(&led->chip->mutex);
258
259	return ret;
260	}
261
262	static int aw2013_probe_dt(struct aw2013 *chip)
263	{
264	struct device_node np = chip->client->dev.of_node, child;
265	int count, ret = 0, i = 0;
266	struct aw2013_led *led;
267
268	count = of_get_child_count(np);
269	if (!count \|\| count > AW2013_MAX_LEDS)
270	return -EINVAL;
271
272	regmap_write(chip->regmap, AW2013_RSTR, AW2013_RSTR_RESET);
273
274	for_each_available_child_of_node(np, child) {
275	struct led_init_data init_data = {};
276	u32 source;
277	u32 imax;
278
279	ret = of_property_read_u32(child, "reg", &source);
280	if (ret != 0 \|\| source >= AW2013_MAX_LEDS) {
281	dev_err(&chip->client->dev,
282	"Couldn't read LED address: %d\n", ret);
283	count--;
284	continue;
285	}
286
287	led = &chip->leds[i];
288	led->num = source;
289	led->chip = chip;
290	init_data.fwnode = of_fwnode_handle(child);
291
292	if (!of_property_read_u32(child, "led-max-microamp", &imax)) {
293	led->imax = min_t(u32, imax / 5000, 3);
294	} else {
295	led->imax = 1; // 5mA
296	dev_info(&chip->client->dev,
297	"DT property led-max-microamp is missing\n");
298	}
299
300	of_property_read_string(child, "linux,default-trigger",
301	&led->cdev.default_trigger);
302
303	led->cdev.brightness_set_blocking = aw2013_brightness_set;
304	led->cdev.blink_set = aw2013_blink_set;
305
306	ret = devm_led_classdev_register_ext(&chip->client->dev,
307	&led->cdev, &init_data);
308	if (ret < 0)
309	return ret;
310
311	i++;
312	}
313
314	if (!count)
315	return -EINVAL;
316
317	chip->num_leds = i;
318
319	return 0;
320	}
321
322	static const struct regmap_config aw2013_regmap_config = {
323	.reg_bits = 8,
324	.val_bits = 8,
325	.max_register = AW2013_REG_MAX,
326	};
327
328	static int aw2013_probe(struct i2c_client *client)
329	{
330	struct aw2013 *chip;
331	int ret;
332	unsigned int chipid;
333
334	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
335	if (!chip)
336	return -ENOMEM;
337
338	mutex_init(&chip->mutex);
339	mutex_lock(&chip->mutex);
340
341	chip->client = client;
342	i2c_set_clientdata(client, chip);
343
344	chip->regmap = devm_regmap_init_i2c(client, &aw2013_regmap_config);
345	if (IS_ERR(chip->regmap)) {
346	ret = PTR_ERR(chip->regmap);
347	dev_err(&client->dev, "Failed to allocate register map: %d\n",
348	ret);
349	goto error;
350	}
351
352	chip->vcc_regulator = devm_regulator_get(&client->dev, "vcc");
353	ret = PTR_ERR_OR_ZERO(chip->vcc_regulator);
354	if (ret) {
355	if (ret != -EPROBE_DEFER)
356	dev_err(&client->dev,
357	"Failed to request regulator: %d\n", ret);
358	goto error;
359	}
360
361	ret = regulator_enable(chip->vcc_regulator);
362	if (ret) {
363	dev_err(&client->dev,
364	"Failed to enable regulator: %d\n", ret);
365	goto error;
366	}
367
368	ret = regmap_read(chip->regmap, AW2013_RSTR, &chipid);
369	if (ret) {
370	dev_err(&client->dev, "Failed to read chip ID: %d\n",
371	ret);
372	goto error_reg;
373	}
374
375	if (chipid != AW2013_RSTR_CHIP_ID) {
376	dev_err(&client->dev, "Chip reported wrong ID: %x\n",
377	chipid);
378	ret = -ENODEV;
379	goto error_reg;
380	}
381
382	ret = aw2013_probe_dt(chip);
383	if (ret < 0)
384	goto error_reg;
385
386	ret = regulator_disable(chip->vcc_regulator);
387	if (ret) {
388	dev_err(&client->dev,
389	"Failed to disable regulator: %d\n", ret);
390	goto error;
391	}
392
393	mutex_unlock(&chip->mutex);
394
395	return 0;
396
397	error_reg:
398	regulator_disable(chip->vcc_regulator);
399
400	error:
401	mutex_destroy(&chip->mutex);
402	return ret;
403	}
404
405	static int aw2013_remove(struct i2c_client *client)
406	{
407	struct aw2013 *chip = i2c_get_clientdata(client);
408
409	aw2013_chip_disable(chip);
410
411	mutex_destroy(&chip->mutex);
412
413	return 0;
414	}
415
416	static const struct of_device_id aw2013_match_table[] = {
417	{ .compatible = "awinic,aw2013", },
418	{ /* sentinel */ },
419	};
420
421	MODULE_DEVICE_TABLE(of, aw2013_match_table);
422
423	static struct i2c_driver aw2013_driver = {
424	.driver = {
425	.name = "leds-aw2013",
426	.of_match_table = of_match_ptr(aw2013_match_table),
427	},
428	.probe_new = aw2013_probe,
429	.remove = aw2013_remove,
430	};
431
432	module_i2c_driver(aw2013_driver);
433
434	MODULE_AUTHOR("Nikita Travkin <nikitos.tr@gmail.com>");
435	MODULE_DESCRIPTION("AW2013 LED driver");
436	MODULE_LICENSE("GPL v2");